Android 使用listview删除BaseAdapter中的ConvertView运行时
我正在使用BaseAdapter的getView()方法开发一个动态检索所有音频文件(带有相册艺术)的应用程序 现在我如何在触摸listView时删除项目。 (例如,如果我单击listView的第三项,则第三项应被删除或删除) 音乐\u光标代码:Android 使用listview删除BaseAdapter中的ConvertView运行时,android,listview,baseadapter,mediastore,audio,Android,Listview,Baseadapter,Mediastore,Audio,我正在使用BaseAdapter的getView()方法开发一个动态检索所有音频文件(带有相册艺术)的应用程序 现在我如何在触摸listView时删除项目。 (例如,如果我单击listView的第三项,则第三项应被删除或删除) 音乐\u光标代码: String[] proj = { MediaStore.Audio.Media._ID, MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.DISPLAY_NAME
String[] proj = { MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Video.Media.SIZE, MediaStore.Audio.Media.ARTIST,
MediaStore.Audio.Media.ALBUM_ID, MediaStore.Audio.Media.TITLE };
Cursor musiccursor = managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
proj, null, null, null);
int count = musiccursor.getCount();
适配器代码:
public class MusicAdapter extends BaseAdapter {
private Context mContext;
public MusicAdapter(Context con) {
mContext = con;
}
public int getCount() {
return count;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView,
ViewGroup parent) {
String id = null;
ViewHolder holder;
LayoutInflater inflater = getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.sub_layout, null);
holder = new ViewHolder();
holder.ID_ = (TextView) convertView.findViewById(R.id.txtSongName);
holder.SIZE_ = (TextView) convertView.findViewById(R.id.txtSongSize);
holder.ARTIST = (TextView) convertView.findViewById(R.id.txtSongArtist);
holder.TITLE_image = (ImageView) convertView.findViewById(R.id.imgArtWork);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// code for retrieving audio name and set to textView
music_column_index = musiccursor
.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME);
musiccursor.moveToPosition(position);
id = musiccursor.getString(music_column_index);
holder.ID_.setText(id);
holder.ID_.setTextSize(15);
// code for retrieving audioSize and set to textView
music_column_index = musiccursor
.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE);
musiccursor.moveToPosition(position);
id = (musiccursor.getString(music_column_index) + " (KB)");
holder.SIZE_.setText(id);
holder.SIZE_.setTextSize(15);
// code for retrieving audio_Artist name and set to textView
music_column_index = musiccursor
.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST);
musiccursor.moveToPosition(position);
id = musiccursor.getString(music_column_index);
holder.ARTIST.setText(id);
holder.ARTIST.setTextSize(15);
// code for retrieving album-art(from albumid) and set to ImageView
musiccursor.moveToPosition(position);
album_id_long = musiccursor.getLong(musiccursor
.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID));
Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart");
Uri uri = ContentUris.withAppendedId(sArtworkUri, album_id_long);
ContentResolver res = MusicActivity.this.getContentResolver();
InputStream in = null;
try {
in = res.openInputStream(uri);
} catch (FileNotFoundException e1) {
e1.printStackTrace();
}
Bitmap artwork = BitmapFactory.decodeStream(in);
holder.TITLE_image.setImageBitmap(artwork);
convertView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//on this code of onClick,a selected item should be deleted
}
});
return convertView;
}
private class ViewHolder {
TextView ID_;
TextView SIZE_;
TextView ARTIST;
ImageView TITLE_image;
}
}
如果有其他方法可以做到这一点。
我们将非常感谢
谢谢。您必须覆盖
public void onListItemClick(ListView l, View v, int position, long id)
单击视图时,将调用此回调。调用它时,您可以从数据库中删除条目,然后重新运行您创建的查询以填充列表视图。如果您正在扩展活动
而不是列表活动
,则必须设置OnItemClickListener
yourListView.setOnItemClickListener(
new OnItemClickListener()
{
@Override
public void onItemClick(AdapterView<?> arg0, View view,
int position, long id) {
}
}
);
yourListView.setOnItemClickListener(
新的MClickListener()
{
@凌驾
public void onItemClick(AdapterView arg0,视图,
内部位置,长id){
}
}
);
您真的要删除音乐文件还是从列表视图中删除它?
顺便说一下,你只需要打电话
“音乐指挥者。移动位置(位置);”
一开始我没有这样做@blackbeltonListItemClick不能覆盖类中的任何软件,我该怎么办。@blackbelt??你是在扩展Activity还是ListActivity?我编辑了我的答案。如果我可以建议你,当你管理游标和列表视图时,你应该使用游标适配器和游标加载。实际上,我需要这两种操作。但是,首先我必须先从列表视图中删除项。我还可以使用fix arrayAdapter删除,但现在文件来自getViw区域。我无法处理删除操作。